/* roulang page: index */
:root {
      --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --color-navy: #0F172A;
      --color-cyan: #0EA5E9;
      --color-emerald: #10B981;
    }
    body {
      font-family: var(--font-stack);
      color: #334155;
      background-color: #FFFFFF;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .hero-skew-bg {
      clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
    }
    @media (max-width: 768px) {
      .hero-skew-bg {
        clip-path: polygon(0 0, 100% 0, 100% 96%, 0 100%);
      }
    }
    .text-gradient {
      background: linear-gradient(135deg, #0EA5E9 0%, #10B981 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 350px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }